Process of producing coloring-matter for paper-making and similar manufactures.



JACOB HAHN, or BUFFALO, NEW Yam.

PROCESS OF PRODUCING COLORING-MATTER FOR PAPER-MAKING AND SIMILAIt MANUFACTURES.

No Drawing.

To all/whom it may concern Be it known that I, JAcoB HAHN, a citizen of the United States, and a resident of the city of Buffalo, county of Erie, and State of New York, have invented a Process of Producing Coloring-Matter for Paper- Making and Similar Manufactures, of which the following is a full, clear, and exact description.

The invention, generally stated, consists in so treating pigmentary coloring matters as to effect better retention thereof by, adhesion to and uniformity of distribution throughout the fibrous material constituting the pulp or basic stock of the paper or other manufacture; and further such coal tar colors as are adapted to employment in the process hereinafter to be described may be used in conjunction with the pigmentary coloring matters.

As an example, I have selected ultrama- 'rine as the pigmentary coloringmatter because it is a well known and extensively used substance in the paper making and similar arts.

100 pounds of ultramarine, preferably in fine powdered condition, are put into a tank with sufficient water, and 20 pounds of rosin size, consisting of 16 pounds of rosin and 4 pounds of soda ash combined in the manner well known, are then added to the ultramar ne and water in the tank, and the rosin Sue and ultramarine are thoroughly mixed together in the Water by agitation which is preferably continuous. 10 pounds of barium chlorid dissolved in a suitable amount of water are then added and after due a tat1 0n or mixing, the result will be that tilie rosin size will be precipitated by the barium chlorid upon the ultramarine, enveloping every particle of it.

The supernatant liquid is then separated from the precipitate in any preferred manner, as by decantation, filtration, or in any other way. The precipitate is then washed with water to get rid of any excess of the barium chlorid and also any impurities which may have formed during the process. The mass is then subjected to pressure or otherwise manipulated to expel the excess of water.

The material may, be used in paste form or all the water may be expelled and the Specification of Letters Patent, Application filed October 8, 1913. Serial No. 793,979.

Patented Sept. 15, 1914..

product, if desired, may be ground into fine powdered condition.

Instead of the barium chlorid, other equivalently acting salts may be used, such as alum, copper sulfate, iron sulfate, magnesium sulfate, magnesium chlorid, zinc salts, and the like. They are all used in liquid form and may be used separately or some of them combined. 7

' In the use of my product, the paper maker proceeds in the usual way, that is to say, the desired quantity of pulp or other base .is placed in the beater, and the requisite amount of water, and rosin size, or its equiv alent, is added. The desired amount of my treated coloring material is then added and finally alum is added. The beater is continually operated so that its contents are combmed and maintained 1n a homogeneous mlxture.

For modifying the shade or tint of the color and obtaining certain desirable shades,

I may add to my treated coloring material during its manufacture, such coal tar colors as may be precipitated in the same manner as described above relative to the pigmentary coloring material.

By the use of my invention better retention of the coloring material by the pulp or other base will result, even with a less quantity of size, than if untreated coloring material is used. There resultsa marked improvement in the retention of the coloring material so treated, by the pulp or other base and its adhesion thereto is also in-' creased, so that a much less amount of the rosin or equivalent size than formerly may be used. Also a more uniform distribution of the coloring material throughout the pulp or other base results when my treated coloring material is used. Moreover, when ultramarine and some other pigmentary materials are treated and used they attain a better alum resistancy and better resistance to acids generally. While not an acid, alum has an acid tendency and is specially deleterious to ultramarine. Also the back Water willbe much more free from coloring material when my treated coloring material is used than otherwise, because the coloring material will all of it, or substantially all of it, go to the fiber and not remain in the back Water.

My invention is applicable to all fillers, such as clay and the like, and pigmentary material generally, such as oxide of iron, chrome yellow, chrome green, and the like, the ochres, umbers and the like.

It will be obvious to those who are familiar with such matters that certain departures may be made from the specific procedure above described by me Without departing materially, if at all, from the invention made by me. I therefore do not limit myself to the details of the procedure above described. Furthermore the proportions given by me are presented as an example merely which will produce good results. As is. Well known, in any process of this character, proportions may be and sometimes should be materially varied.

I claim:

1. vThe described process for producing coloring matter for paper making and similar manufactures, consisting iii thoroughly mixing pigment with rosin size in the, presence of water, and subjecting the same to the precipitating action of a suitable salt.

2. The described process for producing coloring matter for paper making and similar manufactures, consisting in thoroughly mixing pigment with rosin size in the presence of water, subjecting the same to the precipitating action of a suitable salt, and

separating the supernatant liquid therefrom.

3. The described process for producing coloring matter-for paper making and simi-. lar manufactures, consisting in thoroughly mix ng pigment with rosin size in the presence of water, subjecting the same to the coloring matter for paper making and similar manufactures, consisting in thoroughly mixing pigment with rosin size in the pres- -ence of water, subjecting the same to the precipitating action of a suitable salt, separating the supernatant liquid therefrom, washing the precipitate with water to re- .move the excess of salt and impurities, if any, and expelling the wash water from the precipitate.

'5. The described process for producing coloring matter for paper making and similar manufactures, consisting inthoroughly mixing pigment with rosin size in the presence of water, subjecting the same to the precipitating action of a suitable salt, separating the supernatant liquid therefrom,

washing the precipitate with water to re- 'move the excess of salt and impurities, if

any, expelling the wash water from the precipitate and drying the product.

In testimony whereof 'Ihave signed my two subscribing witnesses 1 JACOB HAHN.

Witnesses:

CHAS. NEWTON, Manon BIRDsEY.

name to this-specification in the presence of 

